Spin thermoelectric properties based on a Rashba triple-quantum-dot ring

Based on a Rashba triple-quantum-dot ring, we theoretically investigate spin thermoelectric properties by using the nonequilibrium Green's function method. Our results show that thermoelectric properties arc strongly influenced by the Rashba effect. The underlying reason is the antiresonance effect from Rashba spin-orbit interaction. When the magnetic field and Rashba phase factor satisfy a certain relationship, the value of the spin-dependent Seebeck coefficient alternates between its maximum and zero, and then a pure spin-dependent thermoelectric generator can he obtained. Moreover, we also find that the on-site Coulomb interaction is helpful to obtain a large amplitude for the figure of merit and a high Seebeck coefficient. Published by AIP Publishing.